Lens Calibration

Lens Calibration

Many fo you know that I was having some focus problems from my Canon 7d. Here is an update on what is going on. I sent the camera back to canon for repair, and after 3 days (thanks CPS) the camera came back along with an explanation of the repair. The “focus assembly was adjusted” and a few other minor problems were discovered but were not a contributing factor to the focus problems ( one of the problems was with the compact flash reader causing an occasional err99). I got the camera back, and went out and shot a few images with the 17-35L and looked at the images and they looked pretty good. i was encouraged. then we left for a 3 day family trip to the smoky’s. I spent time shooting the camera, and found that a few of my lens were working great, and a few that were not working great. The 85L was out of focus, but it was focusing very consistently out of focus. I sat down this morning and calibrated all of my lenses. here are the targets after calibration:

85L @1.2:

Sigma 50 @1.4:
24L @ 1.4 ( i did have to sharpen this one because the 24L is pretty soft wide open):
Canon 17-40 @ 40mm, f4:
Camera was tripod mounted, and i shot tethered to my laptop so i could view the images at 1:1 or 1:2 magnification. All images are straight from camera with no edits (except for cropping on the wide angles, so you can’t see my messy kitchen 🙂 and for the 24L which was sharpened in PS).

I am hopeful that this will solve the problems. I’ll keep you posted.

1 Comment

  1. Hey Benjamin. Now that you're calibrated by CPS. You may want to check out the Focus Pyramid Lens Calibration Tool. You can find it on Amazon, eBay an a bunch of other site. Give it a Google lookup, it's less than 20 bucks.

    Reply

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